if (!dojo._hasResource["dojo.dnd.Mover"]) { //_hasResource checks added by build. Do not use _hasResource directly in your code.
    dojo._hasResource["dojo.dnd.Mover"] = true;
    dojo.provide("dojo.dnd.Mover");

    dojo.require("dojo.dnd.common");
    dojo.require("dojo.dnd.autoscroll");

    dojo.declare("dojo.dnd.Mover", null, {
        constructor: function(node, e, host) {
            // summary: an object, which makes a node follow the mouse,
            //	used as a default mover, and as a base class for custom movers
            // node: Node: a node (or node's id) to be moved
            // e: Event: a mouse event, which started the move;
            //	only pageX and pageY properties are used
            // host: Object?: object which implements the functionality of the move,
            //	 and defines proper events (onMoveStart and onMoveStop)
            this.node = dojo.byId(node);
            this.marginBox = {l: e.pageX, t: e.pageY};
            this.mouseButton = e.button;
            var h = this.host = host, d = node.ownerDocument,
                    firstEvent = dojo.connect(d, "onmousemove", this, "onFirstMove");
            this.events = [
                dojo.connect(d, "onmousemove", this, "onMouseMove"),
                dojo.connect(d, "onmouseup", this, "onMouseUp"),
                // cancel text selection and text dragging
                dojo.connect(d, "ondragstart", dojo, "stopEvent"),
                dojo.connect(d, "onselectstart", dojo, "stopEvent"),
                firstEvent
            ];
            // notify that the move has started
            if (h && h.onMoveStart) {
                h.onMoveStart(this);
            }
        },
        // mouse event processors
        onMouseMove: function(e) {
            // summary: event processor for onmousemove
            // e: Event: mouse event
            dojo.dnd.autoScroll(e);
            var m = this.marginBox;
            this.host.onMove(this, {l: m.l + e.pageX, t: m.t + e.pageY});
        },
        onMouseUp: function(e) {
            if (this.mouseButton == e.button) {
                this.destroy();
            }
        },
        // utilities
        onFirstMove: function() {
            // summary: makes the node absolute; it is meant to be called only once
            var s = this.node.style, l, t;
            switch (s.position) {
                case "relative":
                case "absolute":
                // assume that left and top values are in pixels already
                    l = Math.round(parseFloat(s.left));
                    t = Math.round(parseFloat(s.top));
                    break;
                default:
                    s.position = "absolute";    // enforcing the absolute mode
                    var m = dojo.marginBox(this.node);
                    l = m.l;
                    t = m.t;
                    break;
            }
            this.marginBox.l = l - this.marginBox.l;
            this.marginBox.t = t - this.marginBox.t;
            this.host.onFirstMove(this);
            dojo.disconnect(this.events.pop());
        },
        destroy: function() {
            // summary: stops the move, deletes all references, so the object can be garbage-collected
            dojo.forEach(this.events, dojo.disconnect);
            // undo global settings
            var h = this.host;
            if (h && h.onMoveStop) {
                h.onMoveStop(this);
            }
            // destroy objects
            this.events = this.node = null;
        }
    });

}
